115. A sample of 2.0 moles of 02(8) (assumed ideal) at 500 K is expanded from 5 L to 50 L under adiabatic and reversible conditions. The change in its internal

115. A sample of 2.0 moles of 02(8) (assumed ideal) at 500 K is expanded from 5 L to 50 L under adiabatic and reversible conditions. The change in its internal energy (in kJ) is close to R 8.3JK mor; Cym = 5R) 2.-12.S 4.-7.5 1.-22.5 3.-19.1